Journal
CHEMOSPHERE
Volume 251, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.126348
Keywords
Waste brick; ZnO nanopillars; Underwater superhydrophobicity; Hydrophobicity; Versatile oil/water separation; Waste-to-resource strategy
Categories
Funding
- National Natural Science Foundation of China [21706100, 21878132]
- Natural Science Foundation of Hebei Province [B2019108017]
- Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRF18003]
- Key Laboratory of Functional Molecular Solids Foundation [FMS201907]
- Youth Talent Cultivation Program of Jiangsu University
- High-Level Personnel Training Project of Jiangsu Province [BRA2016142]
- Key Research and Development Program of Jiangxi Province [20171BBH80008]
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Due to the variety of oily wastewater and complexity of separation system, it has put forward new challenge and requirement to separation materials for on-demand separation of various oil/water mixtures. Here, we reported a facile waste-to-resource strategy to rationally fabricate hierarchical ZnO nanopillars coating onto the surface of waste brick grains (ZnO/WBG) via simple physical process and in-situ growth technique. Specifically, the directly as-prepared ZnO/WBG possess superhydrophilic/underwater superoleophobic (UWSOB) properties and modified ZnO/WBG by organosilicon reagent possess quasi superhydrophobic/superoleophilic (SHOBI) properties. It is also worth noting that this discrete ZnO/WBG with opposite wettability can be accumulated into ZnO/WBG layer with numerous tortuous channel structure, making it feasible for on-demand separating various oil/water mixtures whether immiscible light- and heavy-oil/water mixtures or oil-in-water and water-in-oil emulsions. It has been demonstrated that the filter layers with opposite wettability exhibit high separation efficiency and flux, excellent chemical stability and admirable recyclability. Thus, this novel and cost-effective ZnO/WBG layer holds great promise for large-scale and versatile oil/water separation. Additionally, this work presents a sustainable perspective of effectively utilizing waste brick to construct workable functionalized materials with tremendous application potential, showing far-reaching value and significance in fundamental research and environmental protection. (C) 2020 Elsevier Ltd. All rights reserved.
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